Halstead combi, approx three years old..
central heating working fine, but recently having probs with DHW..
the boiler will only fire up on maximum tap openings...
primary flow switch maybe?
any pointers as to fixing the malady gratefully received.
there's no noticable decrease in the flow rate..
water still flows with gusto when turning on the hw tap..
the difference is, nowadays this is a pre-requisite for obtaining any
hot water.. I'm hoping it's just the flow sensor.. BUT got a sneaky
suspicion it may go deeper.
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